Those fans will be pretty light on the power consumption so it shouldn't be anything to worry about. The NZXT Sentry 2 has more than enough channels and watts per channel for that setup. In my experience it's better to manually adjust fan controllers than to rely on (often glitchy) auto fan control.

Its a decent one I heard someone using it. But I'd suggest the one that goes on your desk NZXT Sentry LXE that puppy is nice. Granted it is more expensive but hey it works and its "Exotic" Looking. But either way if you do choose to go this route, you will be fine running 3-5 fans on just that. Power is your last worry.